I have a 2015 GMC Sierra base model. I found a used roll bar (Sierra) It comes with a third brake light and all the wiring's there. Looks like there's wires for mounting to lights on top of the roll bar and wiring for the third brake light. The plug is the oval shaped with three prongs. I don't think that my truck would have a place to plug that into but looking for help to try at least get the third brake light running connected to the stock truck light. Need info or any help if possible thanks.